PNS Ghazi (previously USS Diablo (SS-479); was a Tench-class diesel-electric and the first fast-attack submarine of the Pakistan Navy, leased from the United States in 1963. Since it was the only submarine of the Pakistan Navy and had the range and capability to undertake operations in the distant waters controlled by the enemy, Ghazi was pressed into operation to destroy or damage INS Vikrant , India's flagship aircraft carrier during the 1971 Indo-Pak war. PNS Ghazi - USS Diablo Sinking of PNS Ghazi is one of the most mysterious things about 1971 war. The Indian and and Pakistan quote different reasons for sinking of PNS Ghazi. India says that INS Rajput was the one responsible for hitting PNS Ghazi on that fateful day and Ghazi was sunk by a clever plan by Indian Navy. The Pakistani Navy thought the INS Vikrant is near Visakhapatnam but it was out near Andaman when INS Rajput was at Visakhapatnam. PNS Ghazi came in search of INS Vikrant but was baffled by INS Rajput and